There are some fundamental practices you should follow:
Use Inline CSS: Most email clients strip out external CSS. Therefore, always use inline styles for better compatibility. Table-Based Layouts: While modern web design uses divs and CSS for layout, email clients often render table-based layouts more consistently. Alt Text for Images: Always include alt text for images to improve accessibility and provide context if images do not load. Responsive Design: Use media queries and fluid grids to make your emails responsive.